Furnace structure



fjf ATTOR EY June 17, 1930.

J. F. BOORAEM AL FURNACE STRUCTURE Filed May 12 1927 7 Sheets-Sheet l June 17, 1930. J. F, BOORAEM ET AL 1,763,920

FUNACE STRUCTURE Filed May 12, 1927 '7 Sheets-Sheet 2 /v lNvENToRS June 17,-1930. L F BOORAEM El' Al.. .A Y 1,763,920

FURNACE STRUCTURE AFiled May l2, 1927 '7 Sheets-Sheet 3 Zvv jv lilOR w June 17, 1930. ,1 r:` BOORAEM El' AL FURNAGE STRUCTURE Filed May 12, 1927 7 Sheets-Sheec 4 June 17, 1930.

FURNACE S TRUCTURE Filed May 12, 1927- 7 sheets-sheet. 5

)iw/Qu ATTQRN v J. F. BooRAEM ET Al. 1,763,920

` June 17, 1930.

J. F. BooRAEM Er AL 1,763,920

FURNACE STRUCTURE Filed May l2, 1927 7 Sheets-Sheet 6 IN l-:Nrons i EdwarJJy/ZZJIL am] JQ-300mm ATT RNEY Patented June 17, 1930 t -1,763,92o i .i cris JOHN .FRANCIS BOORAEM AND EDWARD J. I-IATTON, OF GREENWICH, CONNECTICUT FURNACE STRUCTURE Appli-cation filed. May 12,

\ mixture with unignited fuel in order to facilitate and obtain more perfect combustion l of the fuel.

More particularly, our invention involves certain novel features in the wall structure of the furnace whereby the wall is provided with a plurality of parallel communicating air passages into which air is drawn by induction from the exterior of the furnace and in its course of flow through said passages absorbs heat by radiation through the inner portion of the furnace wall, such preheated air being finally drawn from said passages and delivered through the front wall of the furnace into the combustion chamber.

In one practical embodiment of our invention, we propose to vconstruct the furnace with an outer wall consisting of alternating courses of stretcher and header bricks'of the form commonly used in building constructions, and an inner lining wall consisting of courses of refractory fire brick of special form, and said refractory brick being so arranged and co-related with. the stretcher and header brick courses in the outer wall as to produce between said walls circuitous or y on the line 8-8 of Fig. 6;

labyrinthic passages into which air is drawn through suitable apertures inthe outer wall and whereby the Aair will have ample opportunity for the absorption of heat radiated through the refractory brick.

lThe improved furnace structure is especi'ally designed for use in connection with pulverized fuel burning furnaces, and the.

air prelieating passages through the furnace walls preferably communicate at their egress ends with a common chamber extending over thefront side of the furnace and.

from which the preheated air is drawn by induction into the delivery nozzles through which the 'pulverized fuel is discharged under air pressure into the furnace combustion chamber. Y g

lilith the above and other obiects in view, HN:

' stretcher and header brick coursesina modiijnventicn consists in the improved fur-'i g speetive View snowing the neet 1927. Serial No. 190,946.

arrangement ofthe several parts thereof as will be hereinafter more fully y"described, illustrated in the accompanying drawings and subsequently incorporated inthe subjoined claims.

In vthe drawings',y wherein we have dis-` closed several simple and practical embodiments of our present improvements, andy in which similar reference characters designate corresponding parts throughout the several views,- i

Figure l is a planviewl of a furnace embodying our invention, the top thereof being omitted and the front furnace wall being shown in section; j

Fig. 2 is a fragmentary vertical vsectional vriew through one of the furnace walls taken` substantially on the line 25-2 of Fig. l;

Fig. 3 is a fragmentary outer side eleva' tion of .one ofthe inner lining walls of the furnace; i

Fig. 4l is a similar interior elevation of saidV lining wall;

Fig. 5 is a detailvertical sectional view taken on the lineof Fig. l; y

Fig. 6 is a similar sectional view taken. on the line 6-6 of Fig. l; 'c y t VFig. 7 is ahorizontal. sectional view taken on the line'7 7 of 6;- Y e L Fig. 8 is a similar horizontal section taken Fig.A 9' is a fragmentary outer rside elevar tion of .one of the furnace walls showing the relative arrangement of the 'Joints of. thel fied form of the invention;

Fig. 1 0 is a fragmentary horizontal sectional view of the modifiedconstructiong- Fig. 1lv isl a vertical 'sectional 'perspective view on the line ll-ll ,offFigz 12.

F ig.I l2 isa horizontal sectional viewv taken on the line 12-12 of Fig. 10; Y 1

Fig- 13 is a vertical section taken onl the line 13-13 of Fig. l2; `I

Fig. 14 is a detail perspective view illusltrating the arrangement of the header vandi setretclier brick courses in the modified constructiong. Fig. 15 is an internal `fragirientary pering endsv of the angularly related lining 'walls of the furnace at one corner thereof;

Fig. 16 is a horizontalsectional view taken on the line 164-16 of Fig. 15

Fig. 17 is asimilar sectional view taken on the line 17-17 of Fig. 15; j n v l Fig. 18 is a fragmentary perspectiveviewV A similar to Fig. 15 showing Va special formof the corner blocks for the lining walls;

Fig. 19 is a horizontal sectional view taken shown more or less diagrammatically, a typi-y caltype of furnace'` asequipped for the burn'- 1 ing of pulverized fuel.A vTothis end, we have shown the front wall V5V 'of the yfurnace which may be ofsolid masonry construction aspro- "videdwith suitably` spaced inwardly flaring Cil fuel inlet openings therethrough. VUpon the outerface'zof this wall, there is provided Van air receiving chamber Zand passagesV 8V formed through the vopposite ends of'k the V'front'wall 5 open `at one of their ends'into l this .c'hamben A u `The nozzlesindicated at 9- maybe of. anyv `conventional ltype and lthroughthe same pulverized fuel is ejected orY discharged under air'pressure through the l inlet opening 6. andV into 'the combustion chamber'l() of the furnace. V.These'nozzles 9 are provided.y with suitable ports or-openings throughwhich preheated air 1s drawn from lthe chamber? by the induction effect of the, Vejector air for the p'ulverized fuel. For the purpose ofl preheating. thisairsuppliedto the chamber "7, the side and rear walls of theV furnace are constructed in 4the following ,.inan'ner. y c

Am outer furnace'wall proper is built up .ofalternate courses of stretcher brick 11 and header biCklQ. lIn theconstructionshown in*Figs.1to 8 inclusive, the 'joints between f courses are respectivelyin vertical'alignment, the joints betweenlthe 'stretcher *brick` 'being' thebrickin the several 'stretcher andk header staggeredor-outof alignment with the oints Y betweenv the'heade'r brick. These, brick may be I ofr the'usual'V dimensions usedY for'. building 'purposes,fwherein the-:length ofr the' brick isv approximate-ly,V equalv to twice its width.`

'.lherefore,v as shownjinthe drawings, since i' the en dsof lthe bricksinthe header.''courses Ilarefdisposed the-samefplane as the outer VL'faces v.ofthe brickin'thestretcher courses, it will be understood'thajt the'heafder brickgthus project:` inwardly beyondkthe .inner faces-of" Y thel stretcher brick, suchprojectingportions.-V offthegheader.,bricks in adjacent header' Vcourses,being',spaced fromk eachother.

walls of the furnace,A a space'maybe leftv v i l j n n between adjacentbricks inthestretcherior ln'. conjunctionfwith thisf outerfurnface. l i Y Y Y. gwall,` an'V inneren lining'wall isl provided,

the latter wallk being 'built Vup of courses fof" @Specially @estrecha-r@ black .0f liefmetory material as generallyvindicated at 13.

the upper and lower faces of said extension atV the end 'thereof Ybeing rabbeted or recessed as indicated *at* 16 torreceive the inner ends of the header 'course brick 12.' (These recesses present vertical shoulders 17Y against` :which the -ends ofthe headerl brick abut,

thereby .spacing the end facesof `the projeccoursesr are staOGeredvr with relation .to each Y tab other so .that the joints vbetween'the blocks inone course are centrally disposed .with -relation to the joints 1n the adjacent course'` As the reduced extensions '15 of these refractory blocks are somewhatless vthanvone-ha'lf l' Y, 1Go

ofthe widthV of 'the' block,jitwill therefore, y be apparent that vtheisidefaces of these eX-nv v tions l-froin the inner faces of thestretcher.

tensionsV in. the adjacent refractory block courses are spaced laterallyfrom .each other,

thus affording vertical passages asindicated' at 19 whichv connect the several lhorizontal passages 18 with each other.A vThis providesVV a ramified or labyrinthic arrangement of air passages through l`which the air. flowsinpa Y more or less "circuitous course and. increases the surface area of vthe refractory blocks.

with which the airr may VVVcorne into contact and thus absorbthe heat radiated "through said: blocks from the combustionvchamber :ofthe furnace.-y It will be understood.that`V Y the passages 18 inthe several furnace walls are in communication with each other at the 1 meeting ends ofsaidwallaand .these passages -in the side walls' ofV the furnace l,are Y in line with the passages 8'. in the-Vends of,y j

the'fr'ont wall 5 of the furnaceas indicated inv F ig. lof the drawings. HThus, theremayl l bek aV continuous.` flow of theair through .thei

furnace walls tothelchamber Q7.

At desired intervals injthefside and-rear *Y header ycoursesi'to 'thereby 4provide suitable;i

airinlets Vx indicated at 20;communieating with the [outer atmosphere A,andthrough 'i i' sages 18.. Of course, ifv desired, a suitable screen may be providedover the inlet ends of the openings 2O so as to prevent foreign materials being drawnv through said openiin'gs and collecting in the airpassages. It

will be evident that as this cold air travels vertically and horizontally between the outer wall and the inner lining wall of the furnace and in substantially continuous contact with the refractory' lining blocks-13,it will become highly heated by the radiation of heat through said lining blocks. This preheate air is drawnby the comparatively cold ejector air into the nozzles 9 and is ejected with the fuel into the combustion chamber. By the preheating of this air, the ejector air is also heated and the combined oxygen content of the ejector air and the preheated air in association with the pulver-ized fuel,

greatly aids in securing the practically coinplete combustion of the fuel. Thus, the heat of the fuel consumed instead of beingdissipated through the furnace wall structure, x

is `advantageously utilized whereby better combustion of the fuel is obtained so that the desired high temperatures may be maintained within the combustion chamber with a reduced consumption of fuel.

In Figs. 9 to 14 inclusive of the drawings, we have illustrated a slightly modified construction wherein the lire blocks 13 constituting the inner lining wall of the furnace are of the saine construction and arranged in the same manner as above described, and

in which the brick in the header courses 12 of the outer wall are different-ly arranged so as 'to provide for a freer vertical flow of the air between the horizontal passages 18 and thus permitting of a more rapid circulation of the air between the inner and outer wall structures. To this end, as clearly shown in Figs. 10, 12 and 14; of the drawings, full length header course bricks indicated at 21 are arranged in spaced pairs and are adapted to engage at their inner ends inthe rabbets or recesses 16 of the refractory lining blocks 13 and between these spacedpairs of header bricks the half bricks 22 are arranged, thefinner ends of said half bricks being disposed in the saine plane as the inner faces of the stretcher course bricks. As will be seen from reference to Fig. 9 of the drawings, the joints between the bricks 21and '22 in the alternate courses of header bricks are staggered or'lout of,

alignment with each other vertically of the wall and are valso out of alignment with the joints between the interposed stretcher course bricks. From reference to Fig. 10 of the V4drawings, it will be seen that the half bricks 22 in the header courses are in line with` the recesses or'spaced between the reduced outn wardly projecting parts 15 of the refractory linerblecks 13. Thus, it will be noted from reference to Fig. 12, the air may freely iiow vertically from one horizontal passage orchannel 18 to an adjacent passage through the spaces between the projections 15 of the liner blocks and through the open spaces which are thus provided between the spaced pairs of header bricks 21 in the outer wall.

This arrangement Aalso provides for greater opportunity of the moving air currents to contact with the surfaces of the refractory are produced and as may be required in accordance with the predetermined temperaL ture of the preheated air as may be found to produce the best results in securing complete combustion of the particular fuel employed.

ln Figs. 15, 16 and 17, 'wehave shown in detail the arrangement of the lining blocks at the corners of the furnace structure solas to provide for the uninterrupted'continuity.

ofthe passages 18 in theangularly related walls of the furnace. 'It' will, however, be observed that when these lining blocks 13 are all of uniform shape and dimensions, the blocks in the courses of the respective walls being offset or staggered in relation to keach other provide a broken vertical corner joint between the lining walls.` Scot" and dirt will collect in these corner joints which it is difficult to remove, and itl is also more or less diflicultto tightly seal these corner joints, in which case, air willjescape from` the passages 18.

In Figs. 18 to 20 ofthe drawings, we have shown a special forni of the corner blocks for the lining wall whereby the above diflil As shown, these ciilty may be overcome. corner blocks 13 are of L-shaped form in horizontal crosssection, each blockhaving a long arni 13tand a relatively short arm lie" 13b, each of which isfornied with one of the reduced extensions 15', corresponding in striicturewith the extensions A15 of the other lining blocks 13 and adapted `to cooperate with the bricks of the outer wall to for'm the communicating passages 418 in the mani ner above explained. These L-sliaped corner blocksin the-vertically adjacent courses of' the lining wall are also arranged in offset or staggered relation' so that in one course, the longer arni 13a of the cornerblock will extend in the plane of one side of the lining wall while in the adjacent course, the longer 'Y arni of the corner block extends in the plane of the other angularlyrelated lining wall of the furnace. V

The inner rfaces of` these corner'blocks opposedy to the combustion chamber of thefur-` nace, at the juncture of the angularly extend# ing arms thereof are lrounded or concave as Ysho'wniat 13C so as to provide a smooth. un-. n l interruptedfsurface at the corners of the furnace, thus obviating any possibility of [thelodgment of soot or ydirt in the furnace corners and also insuring an air tight` seal Vof the air passages atthe corners of the furnace.

From the foregoing description, it willl be seenthat we haveY deviseda relatively lsimpleY furnace wall structure wherebypreheated Vair will be automatically supplied 'by the Vinduction effect ofthe 'fuel ejecting air whereby the combined oxygen content of the V` air currents under the inruen'ce of `heat inimediately expands vand intimately associates with kthe fuel particles at the point offignition yof the pulverized fuel at tlie'inner face f ofjthe front wall Vof the furnace. ln this manner,,.almostgperfect combustion will be "assured 'and the deposit of unconsunied fuel in 'the forniV of slag in the bottoni of the combustion chamber will V,be substantially eliminated.y ,i Y ,Y Y Itxwill of course, be apparent that the es-y sentia'l features'of our invention as herein described maybe advantageously kappliedv vtofnuinerous different' types of furnaces einployedk forV differentV purposes. Likewise, certain structural changes might be adopted in the refractory blocks constituting the inner lining wall, and the relative arrangement of these blocks and of the bricks in the outer wall might also be varied to meet conditions peculiar to the particular type of furnace. j Accordingly, `itis to be understood that practice, wereserve the privilege. of incorporating the essential features ofthe present disclosure in rvarious other alterna tive structures as maybe fairly considered claims. Y y

We claim: 4 .f Y*

l. In a furnace,a'n outer wall consisting withinV the spirit Vvand scopeV of the I appended4 of alternating courses Vof stretcher ,bricks Yhaving their longer dimension parallel with the wall,;and header brick having their longer dimension extending ltransversely of the and below the stretcher brick v to therebyv provide a lpluralityl of, longitudinally Vextending air passages, said passageslat one of their lends openingftlirougli the outer wall-to the external atmosphere, and jmeans affording"V communication :between the other Yends `of fthe-inmate 5, f

saidpassagesand the combustion chamber of 1,763,9eo y 2. In a furnace, an outer .wallconsisting of alternating courses of stretcher" brick having their longer dimension 4parallel with 4 the wall, and header: brick having their longer dimension extendingtransverselyv o'f the" wall, an inner liningfor the outer wall con-V s ,sisting lof courses of refractory'blockslthe joints between the blocks in one course being staggered with relation to the joints o'f 4 lthe blocks ofV adjacent co-urses,.and each of said blocks havingfa reduced outwardly pro-r I jecting portion 'spaced fromV the stretcher` brick in the outer wall and engaged by the inner ends of adjacent header ,bricky above and below the stretcher Vbrick to thereby vprovide 'a plurality of longitudinallyexp-` tending air passages, said projections of the liner blocks in adjacent superpcsed coursesV being laterally spaced apartand'providing vertical passages connecting said horizontal Y '85." passages with each other, saidfhorizontal passages fat foneV of y theirA ends opening i through the' outer 'wall to the external ating outer alternatingcourses off'stalldar'd stretcher and head-er bricks, the stretcher bricks havingtlieir longer dimensions par,-l allel with the wall andthe longer dimen-Y sions ofthe header bricks extending transvinosphere, and ineansaffording 'communicas s tion between the other ends o'f saidfpassagesVV and the combustion chamber offtheV furnace.;

3. ln a furnace, a: wall structure compris?v versely of thewall, an inner lining consist- Y i ing of superposed "courses of refractory" blocks each provided .at one end with oppo- "sitely fdirected vertical shoulders against 1 ionKV which the innerends ofthe header bricksl abutthe'reby spacingthe end'- faces of said refractory blocks from the stretcher course brick and in conjunction therewith .forming Q a pl'uralityof horizontally extending air pas- 1 sages in comin'unication with l. the external atmosphere, 'and 'inea-ns affording communication between said `passages'ff,and the 'coinbustion chamber of the furnace'.vv

45. In a furnace, a wall structure consist# ing of youter alternating coursesofstandard stretcher` andfheader bricks, the stretcher bricks having their longen diniensionsjparfii- Y `allel *with lthe walland the vlonger dimen.

sions of the header 4bricks :extending trans-' versely of the wall, an inner lining: forffthe n outer wall structure consisting of sup'erposedlV courses vof refractory blocks," eachof saidV `V blocks lbeingcentrally provided fwithfa ref.

duced extension aty its outer endandthe blocks iii adjacent Vcourses being arranged in staggered` relation to laterallyspacel theV thereof with vertically. disposed 1 shoulders against which the inneriends' ofcertain'olfl A Y f the briefs in adjacentlieedsrfeeiSe-be# *block extensions of j one'` course @from theff 7 extensionsof the adjacent courses of blocks, and said reducedextensions, of the blocks.'V Vbeingpro-vided at the upper"and lower sides whereby the end faces of said extensions are spaced from the intervening stretcher course bricks to thereby form spaced horizontally extending air passages in communication with each other vertically of the wall structure between the laterally spaced extensions of the adjacent courses of refractory blocks, and the outer wall having openings therethrough for supplying air to said passages, and means affording communication between said passages and the combustion chamber of the furnace.

5. In a furnace, a wall structure consisting of superposed alternating courses of stretcher and header bricks and a lining for the wall structure composed of superposed courses of heat radiating refractory blocks, each of said blocks having a reduced projection on one end provided with abutment shoulders, and the bricks in each header course being arranged in spaced pairs of full length bricks and an interposed half length brick, said half and full length header bricks being arranged in staggered relation to each other vertically of the wall and said refractory lining blocks in adjacent courses being arranged with said projections in staggered relation to each other, and the spaced pairs of full length header brick engaged with said abutments and spacing the ends of said projections from the stretcher course bricks to thereby provide a plurality of horizontally extending passages, and said half length header bricks permitting of unp obstructed vertical communication betweeen the adjacent passages, said passages being in communication with the external atmosphere through the outer wall, and means affording communication between said passages and the combustion chamber of the furnace. V

In testimony that we claim the foregoing as our invention, we have signed our names hereto.

EDWARD J. HATTON.

JOHN FRANCIS isoonnnivi.Y l 

